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That is the closest I could find. Since it is not easily detectable I do not think it would be common for some one to find such evidence - ever. I think in most cases there was only suspicion of its use.

I don't know of any IRL examples but I am not sure where you are coming from with your question.

I do have some software that detects it, and I will look for the link if you respond with an affirmative.............

I am looking from the tekkie side here like you might want to get a steggie tool then try my tool to crack it?

If your question is purely historical, then I am afraid I don't have any examples.....

If you cannot do someone any good: don't do them any harm....
As long as you did this to one of these, the least of my little ones............you did it unto Me.
What profiteth a man if he gains the entire World at the expense of his immortal soul?

I think an app like that is only semi-useful. It can only detect known ways/algos for hiding things. If some one really wanted to hide something like that they would develop their own way of hiding it..

The problem with worrying about hidden messages is that you can see them anywhere. Just like a brute force decryption can yield every possible message, you can find SOME way of only using certain letters/words of any legitimate document and making it into a message to be worried about. A la "A beautiful mind".

If the world doesn't stop annoying me I will name my kids ";DROP DATABASE;" and get revenge.

If you cannot do someone any good: don't do them any harm....
As long as you did this to one of these, the least of my little ones............you did it unto Me.
What profiteth a man if he gains the entire World at the expense of his immortal soul?